Surgical implant bending system and method

ABSTRACT

An implant bending device includes a first work surface. An implant support is movable relative to the first work surface. A second work surface is movable relative to the first work surface. A sensor is connected with the work surfaces and configured to detect contact of at least one of the work surfaces with an implant. Systems, surgical instruments, spinal constructs, implants and methods are disclosed.

TECHNICAL FIELD

The present disclosure generally relates to medical devices for thetreatment of musculoskeletal disorders, and more particularly to asurgical system and a method, which employ one or more implants that mayrequire bending for treating a spine.

BACKGROUND

Spinal pathologies and disorders such as scoliosis and other curvatureabnormalities, kyphosis, degenerative disc disease, disc herniation,osteoporosis, spondylolisthesis, stenosis, tumor, and fracture mayresult from factors including trauma, disease and degenerativeconditions caused by injury and aging. Spinal disorders typically resultin symptoms including deformity, pain, nerve damage, and partial orcomplete loss of mobility.

Non-surgical treatments, such as medication, rehabilitation and exercisecan be effective, however, may fail to relieve the symptoms associatedwith these disorders. Surgical treatment of these spinal disordersincludes correction, fusion, fixation, discectomy, laminectomy andimplantable prosthetics. As part of these surgical treatments, spinalconstructs such as vertebral rods are often used to provide stability toa treated region. Rods redirect stresses away from a damaged ordefective region while healing takes place to restore proper alignmentand generally support the vertebral members. During surgical treatment,one or more rods may require bending for disposal with the vertebralmembers. Such rods may be attached via fasteners to the exterior of twoor more vertebral members. This disclosure describes an improvement overthese prior technologies.

SUMMARY

In one embodiment, an implant bending device is provided. The implantbending device includes a first work surface. An implant support ismovable relative to the first work surface. A second work surface ismovable relative to the first work surface. A sensor is connected withthe work surfaces and configured to detect contact of at least one ofthe work surfaces with an implant. In some embodiments, systems,surgical instruments, spinal constructs, implants and methods aredisclosed.

In one embodiment, the implant bending device includes a mandrel. Acarrier supports a spinal rod. An arm is rotatable relative to themandrel and engageable with the spinal rod. A detector includes at leastone element that defines at least one opening such that a medium passingthrough the at least one opening is detectable by a sensor to determinecontact of the arm with the spinal rod.

In one embodiment, a method for treating a spine is provided. The methodcomprises the steps of: selecting a curvature of a spinal implant;moving the spinal implant along a first work surface; rotating a secondwork surface to engage the spinal implant relative to the first worksurface such that the spinal implant is manipulated to the selectedcurvature; rotating the second work surface to disengage from the spinalimplant in non-contacting relation; sensing the non-contacting relationand measuring an actual curvature of the spinal implant; and comparingthe actual curvature and the selected curvature to determine springback.

BRIEF DESCRIPTION OF THE DRAWINGS

The present disclosure will become more readily apparent from thespecific description accompanied by the following drawings, in which:

FIG. 1 is a perspective view of components of one embodiment of a spinalimplant system in accordance with the principles of the presentdisclosure;

FIG. 2 is a perspective view of components of one embodiment of a spinalimplant system in accordance with the principles of the presentdisclosure;

FIGS. 3, 4, 5, 6 are graphical representations of a computer showingcomponents of one embodiment of a spinal implant system in accordancewith the principles of the present disclosure;

FIG. 7 is a perspective view, in part phantom, of components of oneembodiment of a spinal implant system in accordance with the principlesof the present disclosure;

FIG. 8 is a break away view, in part phantom, of the components shown inFIG. 1;

FIG. 9 is a break away view, in part phantom, of the components shown inFIG. 1;

FIG. 10 is a break away view of components of the system shown in FIG.1;

FIG. 11 is a perspective view of components of one embodiment of aspinal implant system in accordance with the principles of the presentdisclosure;

FIG. 12 is a break away view, in part phantom, of components of oneembodiment of a spinal implant system in accordance with the principlesof the present disclosure;

FIG. 13 is a break away view of components of one embodiment of a spinalimplant system in accordance with the principles of the presentdisclosure;

FIG. 14 is a perspective view of components of one embodiment of aspinal implant system in accordance with the principles of the presentdisclosure;

FIG. 15 is a perspective view of components of one embodiment of aspinal implant system in accordance with the principles of the presentdisclosure;

FIG. 16 is a perspective view of components of one embodiment of aspinal implant system in accordance with the principles of the presentdisclosure;

FIG. 17 is a perspective view of components of one embodiment of aspinal implant system in accordance with the principles of the presentdisclosure;

FIG. 18 is a cross section view of the components shown in FIG. 17;

FIG. 19 is a cross section view of components of one embodiment of aspinal implant system in accordance with the principles of the presentdisclosure;

FIG. 20 is a perspective view of components of one embodiment of aspinal implant system in accordance with the principles of the presentdisclosure;

FIG. 21 is a perspective view of components of one embodiment of aspinal implant system in accordance with the principles of the presentdisclosure;

FIG. 22 is a perspective view of components of one embodiment of aspinal implant system in accordance with the principles of the presentdisclosure;

FIG. 23 is a perspective view of the components shown in FIG. 22;

FIG. 24 is a perspective view of the components shown in FIG. 23 withparts separated;

FIG. 25 is a cross section view of the components shown in FIG. 21;

FIG. 26 is a top view of the components shown in FIG. 21;

FIG. 27 is a top view of the components shown in FIG. 21;

FIG. 28 is a perspective view of components of one embodiment of aspinal implant system in accordance with the principles of the presentdisclosure;

FIG. 29 is a perspective view of components of one embodiment of aspinal implant system in accordance with the principles of the presentdisclosure;

FIG. 30 is a break away view of components of the system shown in FIG.29;

FIG. 31 is a perspective view of components of one embodiment of aspinal implant system in accordance with the principles of the presentdisclosure;

FIG. 32 is a perspective view of the components shown in FIG. 31, withparts separated;

FIG. 33 is a perspective view of components of one embodiment of aspinal implant system in accordance with the principles of the presentdisclosure;

FIG. 34 is a perspective view of components of one embodiment of aspinal implant system in accordance with the principles of the presentdisclosure;

FIG. 35 is a top view of components of one embodiment of a spinalimplant system in accordance with the principles of the presentdisclosure;

FIG. 36 is a perspective view of components of one embodiment of aspinal implant system in accordance with the principles of the presentdisclosure;

FIG. 37 is a perspective view of components of one embodiment of aspinal implant system in accordance with the principles of the presentdisclosure; and

FIG. 38 is a perspective view of components of one embodiment of aspinal implant system in accordance with the principles of the presentdisclosure disposed with vertebrae.

DETAILED DESCRIPTION

The exemplary embodiments of the surgical system and related methods ofuse disclosed are discussed in terms of medical devices for thetreatment of musculoskeletal disorders and more particularly, in termsof a surgical system and method, which employ one or more implants thatmay require bending for treatment of a spine disorder. In someembodiments, the systems and methods of the present disclosure comprisemedical devices including surgical instruments and implants that areemployed with a surgical treatment, as described herein, for example,with a cervical, thoracic, lumbar and/or sacral region of a spine. Seealso, the examples and disclosure of systems and methods shown anddescribed in commonly owned and assigned U.S. patent application Ser.No. 15/479,051 (Attorney Docket No. C00012926.USU1) filed Apr. 4, 2017,and published as U.S. Patent Application Publication No. ______, on______; and the examples and disclosure of systems and methods shown anddescribed in commonly owned and assigned U.S. patent application Ser.No. ______ (Attorney Docket No. C00015545.USU1) filed Mar. ______, 2017,and published as U.S. Patent Application Publication No. ______, on______, the entire contents of each of these disclosures beingincorporated herein by reference.

In some embodiments, the present system comprises an automated,intra-operative implant bending device. In some embodiments, the implantbending device contours spinal rods for use with pedicle screws to forma corrective spinal construct. In some embodiments, the present systemcomprises an automated rod bender for extradiscal spine surgery. In someembodiments, the implant bending device is employed with spinal rodsmade from cobalt chrome alloys, stainless steel alloys, titanium alloysand/or having rod diameters of 6.0 millimeters (mm) or more.

In some embodiments, the present system comprises an implant bendingdevice and a template, such as, for example, a soft rod that can beeasily formed by a surgeon, in-situ, intra-operatively during theprocedure and/or transferred from a sterile surgical field for analysisto define a selected spinal rod contour. In some embodiments, thetemplate can include a three dimensional scanning device to provide asolid model of a spinal rod. In some embodiments, the model data isconverted into machine code that allows the implant bending device,within the sterile field, to provide a surgery ready duplicate of thesoft rod. In some embodiments, this configuration can be employed toduplicate a model rod in a two rod construct.

In some embodiments, the template includes surgical navigation to definea selected spinal rod contour. In some embodiments, the surgicalnavigation template includes a point-to-point definition of pediclescrew heads that can be utilized to define a spinal rod shape. In someembodiments, the initial definition can be manipulated via surgeonpreference for additional corrective needs of the patient during thesurgical procedure. In some embodiments, the surgical navigationtemplate could be utilized to smooth contours initially defined.

In some embodiments, the template includes a digitizing arm. In someembodiments, the template includes a disposable, single use, digitizingarm. In some embodiments, the digitizing arm defines data points, whichcan be converted into a three dimensional model that is translated intomachine code and communicated to the automated bender. See also, theexamples and disclosure of systems and methods shown and described incommonly owned and assigned U.S. patent application Ser. No. ______(Attorney Docket No. C00015546.USU1) filed Mar. ______, 2017, andpublished as U.S. Patent Application Publication No. ______, on ______,the entire contents of which being incorporated herein by reference.

In some embodiments, the template includes computer generated models ofrod configurations having a selected curvature such that the selectedrod configurations are produced by the automated bender and packagedsterile. In some embodiments, the selected rod configurations could bestored in a variety of locations, including the hospital. In someembodiments, the selected rod configurations can be employed withpre-operative planning including initiatives to plan screw locations andthe corresponding rods needed for correction.

In some embodiments, the present system comprises an implant bendingdevice utilized in a sterile field. In some embodiments, the implantbending device includes a boxed container for disposal of one or morecomponents of the system. In some embodiments, the implant bendingdevice includes drive sockets that are covered with a sterile drape. Insome embodiments, the implant bending device includes a drive plate forforming the spinal rod that is autoclaved and placed upon the steriledrape. In some embodiments, the implant bending device includes driveposts that extend from a top plate and perforate the drape and connectto the drive sockets within the boxed container. In some embodiments,the implant bending device is employed with a method for scoliosissurgery and degenerative length rods. In some embodiments, the implantbending device includes a cube version that allows a surgeon to insertthe rod into the implant bending device and sequentially provide contourto the rod.

In some embodiments, the implant bending device is employed with atemplate that includes one or more of digitizing arms, three dimensionalscanners, orthogonal camera technology, surgical navigation, soft rod insitu, pre-bent configurations and various forms of preoperative planninginitiatives. In some embodiments, the implant bending device includes adrive mechanism contained in an enclosure, which includes drive socketson a top surface and is disinfected and sterile draped. In someembodiments, the implant bending device includes a drive and bendingdevice disposed on a stand-alone plate that is autoclaved. In someembodiments, the drive and bending plate has drive posts that perforatethe sterile drape while at the same time sealing the sterile field fromthe drive enclosure. In some embodiments, the implant bending device isconnected with data storage for storing one or more spinal rodgeometries, for example, in a patient record. In some embodiments, thedata storage can include lordosis angles and sagittal balance criteriacorrelated to rod definition. In some embodiments, the data storageprovides data for spine studies to determine rod profile vs. post-opcorrection achieved.

In some embodiments, the present system comprises an implant bendingdevice utilized in a sterile field and including a base unit driveenclosure, a drive and bending mechanism including a rod transport unitwith drive posts and a sterile drape. In some embodiments, the drive andbending mechanism includes a rod bending head.

In some embodiments, the present system comprises an automated implantbending device, a rod template and three dimensional rod coordinates ofa selected rod configuration such that the implant bending device formsa spinal rod having the selected rod configuration. In some embodiments,the present system comprises an automated implant bending device thatincludes a control device having a displacement module and a bendingmodule, and a spinal rod. In some embodiments, the bending moduleincludes a linear actuator. In some embodiments, the linear actuator hasa force capacity of 680 Newtons (N). In some embodiments, the bendingmodule has a torque application capacity of one or more values in arange of 70-85 Newton-meters (N-m) on a spinal rod. In some embodiments,the displacement module includes a stepper motor and a gear transmissionfor translating a spinal rod. In some embodiments, the displacementmodule includes a stepper motor and a mandrel for rotating a spinal rod.

In some embodiments, the present system comprises an automated implantbending device that includes a computer having a graphical interface,processor and storage media for storage of template and/or spinal roddata. In some embodiments, the graphical interface provides indicia oftemplate and/or spinal rod data including file information, roddiameter, rod material, bending status, bending progress, control pointsand/or three dimensional graphical representation of rod formation. Insome embodiments, the automated implant bending device includes one ormore sensors that communicate with the computer and/or graphicalinterface to provide rod curvature, which may include a geometric anglebetween two consecutive points on a spinal rod, bending angle, which mayinclude elastic spring back of the spinal rod and/or tension/position.In some embodiments, the implant bending device allows a maximum bendangle before rod spring back of 50 angular degrees. In some embodiments,the implant bending device allows a maximum bend angle after rod springback of less than 50 angular degrees. In some embodiments, the implantbending device performs rod bending with an accuracy for rotation of aspinal rod of ±3 angular degrees. In some embodiments, the implantbending device performs rod bending for translation displacement of aspinal rod with an accuracy of ±3 mm. In some embodiments, the implantbending device performs rod bending for a bending angle of a spinal rodwith an accuracy of ±1 angular degree. In some embodiments, the implantbending device performs intra-operative rod bending in a duration ofless than five minutes. In some embodiments, the implant bending deviceperforms rod bending for 4.5, 4.75, 5.5, 6.0 and/or 6.35 mm spinal roddiameters.

In some embodiments, the implant bending device comprises a base unitwith an actuator motor, for example, a stepper motor having a drive witha spiral bevel gear engageable with a spiral bevel gear of an outputshaft. In some embodiments, the output shaft has a spline surface. Insome embodiments, the implant bending device comprises a bending headhaving at least one bending arm. In some embodiments, the output shaftis connected with the bending head.

In some embodiments, the implant bending device comprises an engagementdetector disposed with the bending head. In some embodiments, theengagement detector provides data and/or indicia of non-contact with aspinal rod and engagement with the spinal rod. In some embodiments, theimplant bending device comprises a contact/non-contact measuring devicefor rod bending. In some embodiments, the implant bending devicecomprises an engagement detector that senses spinal rod spring-backafter a spinal rod is bent to a desired angle. In some embodiments, theengagement detector includes an electromechanical mechanism that candetermine when a bending arm of the implant bending device makes initialcontact with the rod, or breaks contact with the rod after a bend. Insome embodiments, the engagement detector provides feedback to defineangular relationships and provides the ability to adjust a bending cycleto yield a selected bend output. In some embodiments, the engagementdetector allows for adjustment of angular relationships in real timeand/or during an intra-operative bending procedure.

In some embodiments, the implant bending device comprises an engagementdetector having one or more elements, such as, for example, two thinoptical discs that contain etched, circular, interference patterns. Insome embodiments, the engagement detector includes at least one discthat is mounted, on-axis, to the rotation of a bending arm of theimplant bending device. In some embodiments, the engagement detectorincludes at least one disc that is mounted, on-axis, to a spring loadedclutch on a motor drive of the implant bending device. In someembodiments, as the bending arm approaches the rod, both discs arealigned such that the interference pattern of the discs is disposed inan open configuration. As the bending arm contacts the rod, the initialcontact bending force engages a clutch of the engagement detector andcreates a difference in the interference pattern such that the discs areoriented out of alignment and disposed in a closed configuration. Insome embodiments, the pattern created by the discs is sensed and/orviewed by a sensor. In some embodiments, the engagement detector isactivated by a change in the disc pattern when bending starts and whenbending ends.

In some embodiments, the engagement detector allows the implant bendingdevice to define angular measurements based on the engagement detectorreading touch-on and touch-off positions of the bending arm relative tothe rod. In some embodiments, the engagement detector allows the implantbending device to detect and record angular measurement for touch andrelease points for real time angular adjustments. In some embodiments,the implant bending device employs the engagement detector to senseangular measurement and adjust to a defined angle, in real time and/orintra-operatively, and can address spring back, rod diameter and rodinconsistencies. In some embodiments, the engagement detector providesdetection sensing capability, which could be utilized to bend scoliosisconfigurations intra-operatively.

In some embodiments, the engagement detector includes a torsion springconnected with discs mounted with the bending head. The discs includealignable openings and are relatively movable for passage or blocking oflight detectable by a sensor. In some embodiments, the discs aredisposed and/or relatively rotatable to dispose the openings in analigned orientation when the bending head and a spinal rod are in anon-contacting relation. In the non-contacting orientation of thebending head and the spinal rod, a sensor detects light emitted throughthe aligned orientation of the openings and transmits a signal, asdescribed herein, to provide data and/or indicia of non-contact of thebending head with the spinal rod. In some embodiments, the discs aredisposed and/or relatively rotatable to dispose the openings in anon-aligned orientation when the bending head and the spinal rod are inan engaging relation. In the engaging orientation of the bending headand the spinal rod, the openings are not aligned and block transmissionof light such that the sensor cannot detect the emitted light andtransmits a signal, as described herein, to provide data and/or indiciaof engagement of the bending head with the spinal rod.

In some embodiments, the bending head is rotated in increments, forexample, increments of 0.5 angular degrees to determine or sense aninitial contact point or engagement of the bending head with a spinalrod, which can represent a “0” degree reference position. For example,if a selected rod curvature includes a 35 degree bend, the bending headrotates 35 degrees in a first direction and engages the spinal rod toeffect a 35 degree bend. The bending head is then rotated in a secondopposite direction in increments, for example, of 0.5 angular degrees todisengage the bending head from the spinal rod. When the bending head nolonger has contact with the spinal rod as detected by the engagementdetector, the resulting bend formed in the spinal rod is measured basedon the bending head position and/or angle relative to the referenceposition. The difference between the resulting bend angle and theselected rod curvature of 35 degrees represents spring back, which caninclude a delta angle measured by the bending head position. In someembodiments, the data and/or indicia from sensors of the implant bendingdevice is displayed from a computer and/or graphical interface, asdescribed herein. In some embodiments, the engagement detector can beemployed with or create a lookup table of spinal rod data, as describedherein, to facilitate compensation for spring back. In some embodiments,the engagement detector can be employed with a method including thesteps of bending a spinal rod to a selected rod curvature, measuringspring back and bending the spinal rod to a new angle with spring backcompensation.

In some embodiments, the engagement detector includes acontact/non-contact clutch. In some embodiments, the contact/non-contactclutch includes interference discs connected with a torsion spring thatfacilitates relative rotation of the discs. In some embodiments, thediscs are disposed with a coupler connected with a drive shaft of theimplant bending device. In some embodiments, the discs are connectedwith a light emitter/detector. In some embodiments, the implant bendingdevice includes sensors.

In some embodiments, the present system acquires digital measurementsthat represent shape data of a spinal rod template representing a finalrod to be implanted with a patient. In some embodiments, the spinal rodtemplate is manually formable. In some embodiments, the spinal rodtemplate has a shape sensor to sense a shape of the template. In someembodiments, a controller receives template shape data from the shapesensor and operates the bending machine to effect a selected curvaturewith a spinal rod. In some embodiments, the present system includes asensor, processor, computer and a bending arm that compensate for rodspring back during an intra-operative bending procedure, and which canbe employed with template shape data.

In some embodiments, one or all of the components of the surgical systemmay be disposable, peel-pack, pre-packed sterile devices. One or all ofthe components of the system may be reusable. The system may beconfigured as a kit with multiple sized and configured components.

In some embodiments, the surgical system of the present disclosure maybe employed to treat spinal disorders such as, for example, degenerativedisc disease, disc hemiation, osteoporosis, spondylolisthesis, stenosis,scoliosis and other curvature abnormalities, kyphosis, tumor andfractures. In some embodiments, the surgical system of the presentdisclosure may be employed with other osteal and bone relatedapplications, including those associated with diagnostics andtherapeutics. In some embodiments, the disclosed surgical system may bealternatively employed in a surgical treatment with a patient in a proneor supine position, and/or employ various surgical approaches to thespine, including anterior, posterior, posterior mid-line, directlateral, postero-lateral, and/or antero-lateral approaches, and in otherbody regions. The surgical system of the present disclosure may also bealternatively employed with procedures for treating the lumbar,cervical, thoracic, sacral and iliac regions of a spinal column. Thesurgical system of the present disclosure may also be used on animals,bone models and other non-living substrates, such as, for example, intraining, testing and demonstration.

The surgical system of the present disclosure may be understood morereadily by reference to the following detailed description of theembodiments taken in connection with the accompanying drawing figures,which form a part of this disclosure. It is to be understood that thisapplication is not limited to the specific devices, methods, conditionsor parameters described and/or shown herein, and that the terminologyused herein is for the purpose of describing particular embodiments byway of example only and is not intended to be limiting. In someembodiments, as used in the specification and including the appendedclaims, the singular forms “a,” “an,” and “the” include the plural, andreference to a particular numerical value includes at least thatparticular value, unless the context clearly dictates otherwise. Rangesmay be expressed herein as from “about” or “approximately” oneparticular value and/or to “about” or “approximately” another particularvalue. When such a range is expressed, another embodiment includes fromthe one particular value and/or to the other particular value.Similarly, when values are expressed as approximations, by use of theantecedent “about,” it will be understood that the particular valueforms another embodiment. It is also understood that all spatialreferences, such as, for example, horizontal, vertical, top, upper,lower, bottom, left and right, are for illustrative purposes only andcan be varied within the scope of the disclosure. For example, thereferences “upper” and “lower” are relative and used only in the contextto the other, and are not necessarily “superior” and “inferior”.

As used in the specification and including the appended claims,“treating” or “treatment” of a disease or condition refers to performinga procedure that may include administering one or more drugs to apatient (human, normal or otherwise or other mammal), employingimplantable devices, and/or employing instruments that treat thedisease, such as, for example, microdiscectomy instruments used toremove portions bulging or herniated discs and/or bone spurs, in aneffort to alleviate signs or symptoms of the disease or condition.Alleviation can occur prior to signs or symptoms of the disease orcondition appearing, as well as after their appearance. Thus, treatingor treatment includes preventing or prevention of disease or undesirablecondition (e.g., preventing the disease from occurring in a patient, whomay be predisposed to the disease but has not yet been diagnosed ashaving it). In addition, treating or treatment does not require completealleviation of signs or symptoms, does not require a cure, andspecifically includes procedures that have only a marginal effect on thepatient. Treatment can include inhibiting the disease, e.g., arrestingits development, or relieving the disease, e.g., causing regression ofthe disease. For example, treatment can include reducing acute orchronic inflammation; alleviating pain and mitigating and inducingre-growth of new ligament, bone and other tissues; as an adjunct insurgery; and/or any repair procedure. In some embodiments, as used inthe specification and including the appended claims, the term “tissue”includes soft tissue, ligaments, tendons, cartilage and/or bone unlessspecifically referred to otherwise.

The following discussion includes a description of a surgical systemincluding a surgical bending device, related components and methods ofemploying the surgical system in accordance with the principles of thepresent disclosure. Alternate embodiments are also disclosed. Referenceis made in detail to the exemplary embodiments of the presentdisclosure, which are illustrated in the accompanying figures. Turningto FIGS. 1-34, there are illustrated components of a surgical system,such as, for example, a spinal implant system 10.

The components of spinal implant system 10 can be fabricated frombiologically acceptable materials suitable for medical applications,including metals, synthetic polymers, ceramics and bone material and/ortheir composites. For example, the components of spinal implant system10, individually or collectively, can be fabricated from materials suchas stainless steel alloys, aluminum, commercially pure titanium,titanium alloys, Grade 5 titanium, super-elastic titanium alloys,cobalt-chrome alloys, superelastic metallic alloys (e.g., Nitinol, superelasto-plastic metals, such as GUM METAL®), ceramics and compositesthereof such as calcium phosphate (e.g., SKELITE™), thermoplastics suchas polyaryletherketone (PAEK) including polyetheretherketone (PEEK),polyetherketoneketone (PEKK) and polyetherketone (PEK), carbon-PEEKcomposites, PEEK-BaSO₄ polymeric rubbers, polyethylene terephthalate(PET), fabric, silicone, polyurethane, silicone-polyurethane copolymers,polymeric rubbers, polyolefin rubbers, hydrogels, semi-rigid and rigidmaterials, elastomers, rubbers, thermoplastic elastomers, thermosetelastomers, elastomeric composites, rigid polymers includingpolyphenylene, polyamide, polyimide, polyetherimide, polyethylene,epoxy, bone material including autograft, allograft, xenograft ortransgenic cortical and/or corticocancellous bone, and tissue growth ordifferentiation factors, partially resorbable materials, such as, forexample, composites of metals and calcium-based ceramics, composites ofPEEK and calcium based ceramics, composites of PEEK with resorbablepolymers, totally resorbable materials, such as, for example, calciumbased ceramics such as calcium phosphate, tri-calcium phosphate (TCP),hydroxyapatite (HA)-TCP, calcium sulfate, or other resorbable polymerssuch as polyaetide, polyglycolide, polytyrosine carbonate,polycaroplaetohe and their combinations.

Various components of spinal implant system 10 may have materialcomposites, including the above materials, to achieve various desiredcharacteristics such as strength, rigidity, elasticity, compliance,biomechanical performance, durability and radiolucency or imagingpreference. The components of spinal implant system 10, individually orcollectively, may also be fabricated from a heterogeneous material suchas a combination of two or more of the above-described materials. Thecomponents of spinal implant system 10 may be monolithically formed,integrally connected or include fastening elements and/or instruments,as described herein.

Spinal implant system 10 comprises an automated, intra-operative systemconfigured to contour spinal implants, such as, for example, a spinalrod 200 with pedicle screws to form a corrective spinal construct 202(FIG. 38). In some embodiments, spinal implant system 10 comprises anautomated implant system for extradiscal spine surgery. In someembodiments, spinal implant system 10 is employed with spinal rod 200fabricated from cobalt chrome and/or having rod diameters of 6.0 mm ormore.

Spinal implant system 10 includes a control device having a computer 14(for example, as shown in FIG. 2). Computer 14 receives data from atemplate, such as, for example, a soft rod 16, as shown in FIG. 1. Rod16 is flexible, bendable and/or malleable and can be formed in-situ,intra-operatively during the procedure and/or transferred from a sterilesurgical field for analysis to define a selected spinal rod contour orconfiguration. For example, a formed rod 16 having a selected implantconfiguration can be scanned with a three dimensional scanning device,as described herein, to generate three dimensional coordinates of theselected implant configuration of formed rod 16. The coordinates of theselected implant configuration are communicated to computer 14 andtransferred to an implant bending device 24 and/or displayed from agraphical interface, as described herein and for example, a monitor 15,as shown in FIG. 2.

In some embodiments, the template can include a three dimensionalscanning device to provide a solid model of a spinal rod 200. In someembodiments, the model data is communicated to computer 14 and/ordisplayed from a graphical interface, as described herein, and convertedinto computer readable machine code. Computer 14 communicates acorresponding signal to implant bending device 24, within a sterilefield, to contour spinal rod 200 and provide a surgery ready duplicateof rod 16. In some embodiments, implant bending device 24 is connectedwith computer 14 and data storage for storing one or more spinal rod 200geometries, for example, in a patient record, pre-bent configurationsand various forms of preoperative planning initiatives. In someembodiments, the data storage can include lordosis angles and sagittalbalance criteria correlated to spinal rod 200 shape. In someembodiments, the data storage provides data for spine studies todetermine spinal rod 200 profile vs. post-op correction achieved.

Rod 16 is manually shaped to a selected implant configuration bydisposing rod 16 in-situ. In some embodiments, rod 16 has a shape sensor(not shown) to sense a shape of rod 16. In some embodiments, computer 14receives rod 16 shape data from the shape sensor and operates implantbending device 24 to effect a selected curvature of spinal rod 200, asdescribed herein. In some embodiments, rod 16 includes a manuallyformable link construction.

In one embodiment, as shown in FIG. 2, the template includes a sensorsystem 450 having a digitizer arm 452. Digitizer arm 452 includes alinkage having a sensor 454 that is engageable with each of thereceivers of bone fasteners 456 to generate three dimensionalcoordinates of a selected implant configuration based on bone fastenerposition with vertebrae V. See, for example, the sensing systemsdisclosed in U.S. Pat. No. 8,177,843, the contents of which beingincorporated by reference herein. The coordinates of each bone fastener456 are identified intra-operatively with digitizer arm 452 and suchdata is communicated to computer 14 to produce a digitized image ofrelative positioning of the engagement configurations of the pediclescrews, which can be displayed from graphical interface 15, as describedherein. Based on such data, computer 14 generates three dimensionalcoordinates of the shape of spinal rod 200 and communicates acorresponding signal to implant bending device 24, within a sterilefield, to contour spinal rod 200. In some embodiments, computer 14generates three dimensional coordinates of the shape of spinal rod 200,which may be determined from intra-operative fluoroscopy with thepedicle screws installed. In some embodiments, digitizer arm 452identifies intra-operatively a position of one or more surfaces ofvertebrae V and/or components of spinal construct 202 to generate thethree dimensional coordinates of the shape of spinal rod 200. In someembodiments, digitizer arm 452 comprises a single use and disposabletemplate.

In one embodiment, the template includes a surgical navigation systemthat generates the three dimensional coordinates of a selected implantconfiguration in connection with computer 14 for display from agraphical interface, as shown in FIGS. 3-6, and communicates thecoordinates to implant bending device 24 within a sterile field, tocontour spinal rod 200, as described herein. The surgical navigationsystem employs a surgical instrument and the graphical interface(s) toacquire data and generate a signal representative of a position of oneor more surfaces of vertebrae V and/or components of spinal construct202. See, for example, similar surgical navigation components and theiruse as described in U.S. Pat. Nos. 6,021,343, 6,725,080, 6,796,988, theentire contents of each of these references being incorporated byreference herein.

The surgical navigation system acquires the data and displays medicalimaging to generate the three dimensional coordinates of the shape ofspinal rod 200 with computer 14. The surgical navigation system caninclude those components disclosed in U.S. Pat. Nos. 8,842,893,7,188,998; 7,108,421; 7,106,825; 7,001,045; and 6,940,941; the entirecontents of each of these references being incorporated by referenceherein. The surgical navigation system can include a tracking system inconnection with acquiring the data. In some embodiments, the trackingsystem can include the STEALTHSTATION® AXIEM™ Navigation System, sold byMedtronic Navigation, Inc. having a place of business in Louisville,Colo. Exemplary tracking systems are also disclosed in U.S. Pat. Nos.8,057,407, 5,913,820, 5,592,939, the entire contents of each of thesereferences being incorporated by reference herein. In some embodiments,fluoroscopic images taken are transmitted to computer 14. Image transfermay be performed over a standard video connection or a digital linkincluding wired and wireless. Computer 14 and/or the graphicalinterface, as described herein, provides the ability to display, via amonitor, as well as save, digitally manipulate, or print a hard copy ofthe received images. In some embodiments, images may also be displayedto the surgeon through a heads-up display.

In some embodiments, the graphical interface, as described herein,provides indicia of template or spinal rod data including fileinformation, diameter of spinal rod 200, material of spinal rod 200,bending status, bending progress, control points and/or threedimensional graphical representation of spinal rod 200 formation. Insome embodiments, implant bending device 24 communicates with computer14 and/or the graphical interface to provide the curvature coordinatesof spinal rod 200, which may include a geometric angle between twoconsecutive points on spinal rod 200, bending angle, which may includeelastic spring back of spinal rod 200 and/or tension/position. In someembodiments, implant bending device 24 allows a maximum bend anglebefore spinal rod 200 spring back of 50 angular degrees. In someembodiments, implant bending device 24 allows a maximum bend angle afterspinal rod 200 spring back of less than 50 angular degrees. In someembodiments, implant bending device 24 performs spinal rod 200 bendingwith an accuracy of ±3 angular degrees. In some embodiments, implantbending device 24 performs rod bending for translation displacement ofspinal rod 200 with an accuracy of ±3 mm. In some embodiments, implantbending device 24 performs spinal rod 200 bending for bending angle ofspinal rod 200 with an accuracy of ±1 angular degree. In someembodiments, implant bending device 24 performs intra-operative spinalrod 200 bending in a duration of less than five minutes. In someembodiments, implant bending device 24 performs spinal rod 200 bendingfor 4.5, 4.75, 5.5, 6.0 and/or 6.35 mm diameters.

Implant bending device 24, as shown in FIGS. 7-11, includes a base, suchas, for example, a boxed container 40 for disposal of one or morecomponents of spinal implant system 10. Implant bending device 24includes a displacement module 18 and a bending module 22. Displacementmodule 18 includes a movable support, such as, for example, a carrier 20that communicates with computer 14, as described herein. Carrier 20 isconfigured to support spinal rod 200 during translation and/or rotation,as described herein.

Bending module 22 includes work surfaces, such as, for example, amandrel 26 and an arm 28, and a contact sensor 30 (FIG. 24), asdescribed herein. Bending module 22 communicates with computer 14 and isengageable with spinal rod 200 to manipulate spinal rod 200 to aselected implant configuration, as described herein. In someembodiments, implant bending device 24 is employed with a method forscoliosis surgery. In some embodiments, implant bending device 24 isemployed with a method of implanting degenerative length spinal rods200.

Displacement module 18 includes an actuator, such as, for example, amotor 42. Motor 42 is enclosed within container 40 and configured topower and rotate gear mechanisms 44, 60, as shown in FIG. 8 anddescribed herein. In some embodiments, a portion of gear mechanisms 44,60 are maintained within a sterile environment within container 40. Gearmechanism 44 includes meshing gears 46, 48 configured to transmitrotational motion into linear motion to translate carrier 20, asdescribed herein. Gear 48 is connected with a drive post, such as, forexample, a shaft 50. Shaft 50 extends between an end 52 and an end 54and includes a threaded surface 56 extending therebetween. Shaft 50 isconfigured for disposal with carrier 20 such that shaft 50 drives and/ortranslates carrier 20 and spinal rod 200 along a length of shaft 50.Shaft 50 is configured to translate carrier 20 to facilitate translationof spinal rod 200 relative to mandrel 26 and arm 28 for contouring, asdescribed herein.

Motor 42 is configured to power rotation of gear mechanism 60. Gearmechanism 60 includes meshing gears 62, 64 configured to transmitrotational motion to carrier 20 to rotate spinal rod 200 according tosignals provided by computer 14, as described herein. Gear 64 isconnected with a drive post, such as, for example, a shaft 70. Shaft 70extends between an end 72 and an end 74 and includes a smooth surface 56extending therebetween. Carrier 20 is configured for movement alongshaft 70. Shaft 70 is configured to actuate rotation of spinal rod 200in response to coordinates of a selected implant configuration providedby computer 14. For example, as spinal rod 200 translates in response tocoordinates of the selected implant configuration provided by computer14, computer 14 sends a signal to rotate spinal rod 200 to a selectedangle to contour spinal rod 200 to a selected shape. Shaft 70 rotatescausing carrier 20 to rotate spinal rod 200, as described herein.

In some embodiments, bending module 22 is utilized intra-operatively ina sterile environment. In some embodiments, container 40 is covered by asterile drape 500. In some embodiments, gear mechanisms 44, 60 areenclosed by a cover 76 disposed outside of container 40. In someembodiments, cover 76 perforates drape 500 to facilitate access tocarrier 20 for disposal of spinal rod 200 and movement of carrier 20 andshafts 50, 70, as described herein.

Displacement module 18 is configured as a linear slide and includescarrier 20. Carrier 20 includes a housing 80 having a portion 82, aportion 84 and a portion 86. Portion 82 includes a collar 88 having asurface 90. Surface 90 includes a threaded surface configured for athreaded engagement with shaft 50. Engagement of surface 82 with surface56 causes carrier 20 to axially translate along shaft 50 between ends52, 54 to effect translation of spinal rod 200 relative to implantbending device 24 to actuate contouring spinal rod 200.

Portion 84 includes a shaft 96. Shaft 96 extends along an axis X1 thatdefines an axis of translation and/or rotation of spinal rod 200. Shaft96 includes an engagement part 98. Part 98 is configured for connectionwith spinal rod 200. In some embodiments, part 98 is configured to gripand/or clamp spinal rod 200 during translation and/or rotation relativeto bending module 22, as described herein. In some embodiments, part 98includes a chuck having an inner surface, such as, for example, a socket(not shown). The socket defines a cavity configured to mate with aportion of spinal rod 200. In some embodiments, the socket may include ashape, such as, for example, oval, oblong, triangular, square,polygonal, irregular, uniform, non-uniform, arcuate, variable and/ortapered. In some embodiments, the socket may have alternate surfaceconfigurations to enhance fixation with spinal rod 200 such as, forexample, rough, arcuate, undulating, mesh, porous, semi-porous, dimpledand/or textured.

Shaft 96 is connected with a gear 100. Gear 100 is engageable with agear 102 disposed with portion 86 and shaft 70. Gears 100, 102 actuaterotation of carrier 20 and spinal rod 200 in response to a signal fromcomputer 14, as described herein. Portion 86 includes gear 102. Gear 102is rotatable by shaft 70 in response to the signals from computer 14 forcontouring spinal rod 200 to the selected implant configuration. Gear102 is rotated into engagement with gear 100. Engagement of gears 100,102 causes carrier 20 and spinal rod 200 to rotate relative to bendingmodule 22. In some embodiments, carrier 20 applies an axial forcecapacity in a range of up to 680 N to spinal rod 200.

Bending module 22, as shown in FIGS. 12-23, includes an actuator, suchas, for example, a stepper motor 110 having a drive, such as, forexample, a planetary gear head 112. Gear head 112 includes a spiralbevel gear 114 engageable with a spiral bevel gear 116 of an outputshaft 118, as shown in FIG. 18. In some embodiments, a gear ratio ofgears 114, 116 is 10:1. In some embodiments, a maximum output torque ofmotor 110 is approximately 510 inch per pound force (in-lbf). Outputshaft 118 includes a spline surface 120. Gears 114, 116 engage androtate shaft 118. In some embodiments, an output of motor 110 isapproximately 510 in-lbf and gears 114, 116 include a gear ratio of 3:2such that an output torque of gears 114, 116 is approximately 765in-lbf. In some embodiments, a maximum output torque of gears 114, 116is approximately 900 in-lbf. In some embodiments, shaft 118 includes atleast one angular contact ball bearing 122 to bear a tolerance of radialand axial loads applied to shaft 118, as shown in FIG. 15. In someembodiments, shaft 118 includes at least one grease seal 124. Shaft 118is enclosed in a housing 126, as shown in FIG. 16.

Bending module 22 includes a timing plate 130, as shown in FIG. 20. Insome embodiments, plate 130 includes a surface that defines a pluralityof openings 132 circumferentially disposed about plate 130. Openings 132are configured to indicate an inner track, such as, for example, a homeposition. In some embodiments, plate 130 includes a surface that definesa plurality of notches 134. Notches 134 are configured to indicate anouter track, such as, for example, a minimum and/or maximum position.Plate 130 is configured to facilitate control and/or timing of therotation of arm 28 in response to the signals from computer 14.

In some embodiments, plate 130 operates in conjunction with sensors,such as, for example, optical sensors 136 disposed about plate 130, asshown in FIG. 20. Sensors 136 are disposed adjacent to a housing 138, asshown in FIG. 21. Sensors 136 are configured to sense a reflection oflight emitted from plate 130 to track and/or gauge rotation of arm 28.Sensors 136 comprise electronic detectors that convert light, or achange in light, into an electronic signal to indicate movement of arm28.

Contact sensor 30, as shown in FIGS. 22-27, detects contact/non-contactof arm 28 with spinal rod 200 and facilitates applying a selected bendto spinal rod 200. Contact sensor 30 is configured to sense aspring-back of spinal rod 200 after spinal rod 200 is contoured. Thespring back of spinal rod 200 facilitates detection if the proper bendwas effected by arm 28. In some embodiments, contact sensor 30 includesan electromechanical mechanism that can determine when arm 28 of implantbending device 24 makes initial contact with spinal rod 200, or breakscontact with spinal rod 200 after a bend to determine the resulting bendangle.

Contact sensor 30 includes one or more elements, such as, for example,optical discs 140 a, 140 b. Discs 140 a, 140 b include indicia, such as,for example, such as, for example, openings 142 a, 142 b. In someembodiments, the indicia of discs 140 a, 140 b can include etchedsurfaces, interference patterns and/or openings having various geometricconfigurations, similar to those described herein.

A coupler 146 is connected with shaft 118 and transmits rotationalmovement to arm 28 from shaft 118 for bending spinal rod 200. Disc 140 ais mounted with coupler 146 and connected with a torsion spring 148disposed with coupler 146. Disc 140 b is mounted with shaft 118. Torsionspring 148 is connected with coupler 146 to bias disc 140 a relative todisc 140 b such that openings 142 a, 142 b are disposed in an alignedorientation, as described herein. In some embodiments, the connection oftorsion spring 148 with discs 140 a, 140 b comprises a clutch.

Contact sensor 30 includes an emitter/detector 144 having a printedcircuit board (PCB) 145. In some embodiments, PCB 145 mechanicallysupports and electrically connects electronic components usingconductive tracks, pads and other features etched from copper sheetslaminated onto a non-conductive substrate. PCB 145, in connection withthe components of contact sensor 30, facilitates sensing of touch-on andtouch-off positions of arm 28 relative to spinal rod 200 such thatcontact sensor 30 sends signals to computer 14 to indicate and recordangular measurement for touch and release points, and real time angularadjustments of bending spinal rod 200, which can be displayed from agraphical interface, as described herein.

In some embodiments, contact sensor 30 provides feedback to defineangular relationships of portions of a spinal rod and provides theability to adjust a bending cycle to yield a selected bend output. Insome embodiments, contact sensor 30 allows for adjustment of angularrelationships in real time and/or during an intra-operative bendingprocedure. In some embodiments, contact sensor 30 facilitatesdetermination of when arm 28 makes initial contact with spinal rod 200,or breaks contact with spinal rod 200 after a bend. In some embodiments,contact sensor 30 provides data and/or indicia of non-contact withspinal rod 200 and engagement with spinal rod 200.

In some embodiments, contact sensor 30 allows implant bending device 24to define angular measurements based on contact sensor 30 readingtouch-on and touch-off positions of arm 28 relative to spinal rod 200.In some embodiments, contact sensor 30 senses angular measurement andadjusts to a defined angle, in real time and/or intra-operatively, andcan address spring back, rod diameter and rod inconsistencies. In someembodiments, contact sensor 30 provides detection sensing capability,which could be utilized to bend scoliosis configurationsintra-operatively.

For example, as arm 28 approaches spinal rod 200, torsion spring 148biases disc 140 a relative to disc 140 b such that openings 142 a, 142 bare disposed in an aligned orientation and an open configuration, asshown in FIG. 26. Openings 142 a, 142 b are aligned for passage of amedium, such as, for example, light that is detectable byemitter/detector 144, and arm 28 and spinal rod 200 are in anon-contacting relation. In the non-contacting orientation of arm 28 andspinal rod 200, contact sensor 30 detects light emitted through thealigned orientation of openings 142 a, 142 b and transmits a signal, asdescribed herein, to computer 14 to provide data and/or indicia ofnon-contact of arm 28 with spinal rod 200, which can be displayed from agraphical interface, as described herein. In some embodiments, the dataand/or indicia can correspond to and include touch-on and touch-offpositions of arm 28 relative to spinal rod 200, and/or related angularadjustment.

As arm 28 contacts spinal rod 200, the initial contact bending force ofarm 28 with spinal rod 200 activates the components of contact sensor30. As arm 28 engages spinal rod 200, coupler 146 encounters aresistance that overcomes the bias of torsion spring 148 and causes disc140 a to rotate relative to disc 140 b for a limited and/or selectedincremental degree of relative rotation. The relative rotation of discs140 a, 140 b creates a difference in openings 142 a, 142 b such thatdiscs 140 a, 140 b are oriented out of alignment and disposed in aclosed configuration, as shown in FIG. 27. The non-aligned pattern ofdiscs 140 a, 140 b is sensed and/or viewed by emitter/detector 144. Insome embodiments, contact sensor 30 is activated by a change in thepattern of disc 140 a, 140 b when bending starts and when bending ends.

Discs 140 a, 140 b are disposed in a non-aligned orientation when arm 28and spinal rod 200 are in an engaging relation. In the engagingorientation of arm 28 and spinal rod 200, openings 142 a, 142 b are notaligned and block transmission of light such that contact sensor 30cannot detect the emitted light and transmits a signal, as describedherein, to computer 14 to provide data and/or indicia of engagement ofthe arm 28 with spinal rod 200, which can be displayed from a graphicalinterface, as described herein.

Mandrel 26 includes a surface 250 having a substantially curvedconfiguration to facilitate contouring of spinal rod 200, as shown inFIGS. 29-30. Surface 250 defines a circumferential groove 252 configuredto facilitate engagement with spinal rod 200. In some embodiments,surface 250 is smooth to facilitate translation and/or rotation ofspinal rod 200 relative to mandrel 26. Mandrel 26 is disposed in aspaced apart relation relative to arm 28 such that mandrel 26 and arm 28define a pathway P to facilitate passage of spinal rod 200, as shown inFIG. 30. Mandrel 26 includes a surface 254 that defines an opening 256.Opening 256 is configured for disposal of a shaft 258. Shaft 258includes a splined end surface 260 configured for engagement withcoupler 146. Engagement of surface 260 with coupler 146 is configured tofacilitate selective rotation of arm 28, as described herein.

Mandrel 26 includes a wall 262. Wall 262 is configured as a stop surfaceto resist and/or prevent rotation of arm 28, as described herein. Wall262 includes a surface 263 that defines an opening 264. Opening 264 isconfigured for disposal of an anti-rotation shaft 266.

Arm 28 includes a part 270 and a part 272. Part 270 includes a circularportion 274, a circular portion 276 and an extension 278 therebetween.Portion 274 includes a surface 280 that defines an opening 282. Opening282 is configured for alignment with opening 256 and for disposal of aportion of shaft 258 to actuate rotation of arm 28, as described herein.Portion 276 includes a surface 284 that defines an opening 286. Opening286 is configured for alignment with an opening of a part 272, asdescribed herein. Opening 286 is configured for disposal of an end of aroller shaft 290, as shown in FIG. 32.

Part 272 includes a circular portion 292, a circular portion 294 and anextension 296 therebetween. Portion 292 includes a surface 298 thatdefines an opening 300. Opening 300 is configured for alignment withopening 256 and for disposal of a portion of shaft 258 to actuaterotation of arm 28, as described herein. Portion 294 includes a surface302 that defines an opening 304. Opening 304 is configured for alignmentwith an opening of a part 270, as described herein. Opening 304 isconfigured for disposal of an end of a roller shaft 290.

Arm 28 is attached with mandrel 26 by aligning openings 282, 256, 300.In some embodiments, washers 306 are utilized. In some embodiments, abushing 308 is disposed with opening 256 to facilitate rotation of arm28. In some embodiments, bushing 308 comprises PTFE-line fiberglass. Ascrew 312 and cap washer 314 are disposed within openings 282, 256, 300such that screw 312 engages a surface of shaft 258 to fix arm 28 withshaft 258 to facilitate actuation of arm 28.

Openings 286, 304 are aligned along shaft 290. A roller 320 and a needlebearing 322 are disposed between portions 276, 294, as shown in FIGS.32-34. Roller 320 includes a surface 324 having a substantially curvedconfiguration. In some embodiments, surface 324 defines acircumferential groove 326 configured to facilitate engagement with andapplication of a force to spinal rod 200. In some embodiments, surface324 is smooth to facilitate translation and/or rotation of spinal rod200 relative to surface 324. In some embodiments, washers 328 areutilized to facilitate transmission of axial forces in the rotatingcomponents and to maintain the components aligned along shaft 290.

In assembly, operation and use, spinal implant system 10, similar to thesystems and methods described herein, includes an automated,intra-operative system configured to contour spinal rod 200 with pediclescrews to form a corrective spinal construct 202, as shown in FIGS.35-38.

In use, to treat the affected section of vertebrae, a medicalpractitioner obtains access to a surgical site including vertebrae inany appropriate manner, such as through incision and retraction oftissues. Spinal implant system 10 may be used in any existing surgicalmethod or technique including open surgery, mini-open surgery, minimallyinvasive surgery, and percutaneous surgical implantation, wherebyvertebrae is accessed through a micro-incision, or sleeve that providesa protected passageway to the area. Once access to the surgical site isobtained, the particular surgical procedure is performed for treatingthe spinal disorder. Spinal implant system 10 is then employed toaugment the surgical treatment.

During the surgical procedure, computer 14 receives data from atemplate, as described herein. The template is employed in-situ and/orintra-operatively during the procedure and/or can be transferred from asterile surgical field for analysis to define a selected spinal rodcontour or configuration of spinal rod 200. For example, upon collectionand/or acquisition of data corresponding to the template, as describedherein, three dimensional coordinates of the selected implantconfiguration of spinal rod 200 are generated. The coordinates of theselected implant configuration are communicated to computer 14 andtransferred to implant bending device 24 and/or displayed from agraphical interface, as described herein.

Implant bending device 24 is utilized intra-operatively in a sterileenvironment. Container 40 is covered by a sterile drape 500. Carrier 20,mandrel 26 and arm 28 perforate drape 500 to facilitate movement andbending of spinal rod 200. Carrier 20, mandrel 26 and arm 28 areconfigured for disinfection by an autoclave.

Spinal rod 200 is connected with implant bending device 24. An end ofspinal rod 200 is engaged with part 98. An end of spinal rod 200 isdisposed within passageway P. Carrier 20 is actuated to axiallytranslate spinal rod 200 relative to mandrel 26 and arm 28. Spinal rod200 translates along surface 252. Surface 320 of arm 28 is rotated intoengagement with spinal rod 200 to bend arm to a desired angle.

Based on the three dimensional coordinates of the selected implantconfiguration of spinal rod 200 communicated to computer 14 andtransferred to implant bending device 24, arm 28 reacts to signals fromcomputer 14 to manipulate and/or bend spinal rod 200 to the selectedimplant configuration. In operation, contact sensor 30 determines orsenses an initial contact point or engagement of arm 28 with spinal rod200, as described herein, which can represent a “0” degree referenceposition, by rotating arm 28 in increments, for example, increments of0.5 angular degrees. Contact sensor 30 sends signals to computer 14 toindicate the “0” degree reference position, which can be displayed froma graphical interface, as described herein.

For example, if a selected curvature of spinal rod 200 includes a 35degree bend, arm 28 rotates 35 degrees in a first direction, as shown byarrow A in FIG. 33, relative to the “0” degree reference position andengages spinal rod 200 to effect a 35 degree bend. Arm 28 is thenrotated in a second opposite direction, as shown by arrow B in FIG. 33,in increments, for example, of 0.5 angular degrees to disengage arm 28from spinal rod 200. When arm 28 no longer has contact with spinal rod200, as detected by contact sensor 30 and described herein, theresulting bend formed in spinal rod 200 is measured based on arm 28position and/or angle relative to the “0” degree reference positiondetected by contact sensor 30. Contact sensor 30 sends signals tocomputer 14 to indicate the position of the resulting bend angle, whichcan be displayed from a graphical interface. The difference between theresulting bend angle and the selected curvature of spinal rod 200 of 35degrees represents spring back, which can include a delta angle measuredby arm 28 position, which can be displayed from a graphical interface.Computer 14 sends signals to implant bending device 24 such that arm 28re-engages spinal rod 200 for further bending operation to facilitatecompensation for spring back to effect the 35 degree bend. In someembodiments, contact sensor 30 can be employed with storage media ofcomputer 14 to create a lookup table to facilitate compensation forspring back. In some embodiments, contact sensor 30 facilitates bendingspinal rod 200 to a selected curvature, measuring spring back andbending spinal rod 200 to a new angle with spring back compensation. Insome embodiments, arm 28 has a torque application capacity of one ormore values in a range of 70-85 N-m on spinal rod 200.

Spinal rod 200, contoured to the selected implant configuration viaimplant bending device 24, is attached with vertebrae V via pediclescrews 456, as shown in FIG. 38, to form spinal construct 202 fortreating a spine disorder. Upon completion of the procedure, thesurgical instruments, assemblies and non-implanted components of spinalimplant system 10 are removed from the surgical site and the incision isclosed.

It will be apparent to those skilled in the art that variousmodifications and variations can be made to various embodimentsdescribed herein without departing from the spirit or scope of theteachings herein. Thus, it is intended that various embodiments coverother modifications and variations of various embodiments within thescope of the present teachings.

What is claimed is:
 1. An implant bending device comprising: a firstwork surface; an implant support movable relative to the first worksurface; a second work surface movable relative to the first worksurface; and a sensor connected with the work surfaces and configured todetect contact of at least one of the work surfaces with an implant. 2.An implant bending device as recited in claim 1, further comprising atleast one element that defines at least one opening such that a mediumpassing through the at least one opening is detectable by the sensor. 3.An implant bending device as recited in claim 1, further comprising aplurality of elements defining openings that are relatively movable foralignment such that a medium passing through the openings is detectableby the sensor.
 4. An implant bending device as recited in claim 3,wherein the openings are relatively movable between an alignedorientation such that the at least one work surface is in anon-contacting relation with the implant and a non-aligned orientationsuch that the at least one work surface and the implant are in anengaging relation.
 5. An implant bending device as recited in claim 1,further comprising a plurality of discs defining openings, the discsbeing connected with the work surfaces and the openings being relativelymovable for alignment such that a medium passing through the openings isdetectable by the sensor.
 6. An implant bending device as recited inclaim 1, further comprising a first disc connected with the first worksurface and a second disc connected with the second work surface, thediscs defining openings that are relatively rotatable between an alignedorientation such that the at least one work surface is in anon-contacting relation with the implant and a non-aligned orientationsuch that the at least one work surface and the implant are in anengaging relation.
 7. An implant bending device as recited in claim 6,wherein the openings comprise an interference pattern that facilitatespassage of a medium through the openings in the non-contacting relationand prevents passage of the medium through the openings in the engagingrelation.
 8. An implant bending device as recited in claim 1, whereinthe sensor communicates a signal representing contact data to a computerprocessor.
 9. An implant bending device as recited in claim 1, furthercomprising an actuator connected with the second work surface such thatthe second work surface is rotatable to engage the implant.
 10. Animplant bending device as recited in claim 1, further comprising anactuator connected with the second work surface such that the secondwork surface is rotatable to engage the implant, disengage from theimplant in non-contacting relation and re-engage the implant tocompensate for spring back.
 11. An implant bending device as recited inclaim 1, further comprising a first actuator connected with the secondwork surface and a second actuator connected with the implant support.12. An implant bending device as recited in claim 11, further comprisingan intra-operative, sterilized container for disposal of the actuators.13. An implant bending device as recited in claim 11, wherein the worksurfaces and the implant support are connected with an outer surface ofthe container.
 14. An implant bending device as recited in claim 1,further comprising an actuator connected with the implant support foraxially translating the implant support relative to the first worksurface.
 15. An implant bending device as recited in claim 1, whereinthe implant support is axially translatable and rotatable relative tothe first work surface.
 16. An implant bending device as recited inclaim 1, wherein the implant support comprises a linear carrier slideengageable with a screw shaft.
 17. An implant bending device as recitedin claim 1, further comprising a first shaft that axially translates theimplant support relative to the first work surface and a second shaftincluding a gear arrangement that rotates the implant support relativeto the first work surface.
 18. An implant bending device comprising: amandrel; a carrier that supports a spinal rod; an arm rotatable relativeto the mandrel and engageable with the spinal rod; and a detectorincluding at least one element that defines at least one opening suchthat a medium passing through the at least one opening is detectable bya sensor to determine contact of the arm with the spinal rod.
 19. Amethod for treating a spine, the method comprising the steps of:selecting a curvature of a spinal implant; moving the spinal implantalong a first work surface; rotating a second work surface to engage thespinal implant relative to the first work surface such that the spinalimplant is manipulated to the selected curvature; rotating the secondwork surface to disengage from the spinal implant in non-contactingrelation; sensing the non-contacting relation and measuring an actualcurvature of the spinal implant; and comparing the actual curvature andthe selected curvature to determine spring back.
 20. A method fortreating a spine as recited in claim 19, further comprising the step ofrotating the second work surface to re-engage the spinal implant tocompensate for spring back and manipulate the spinal implant to theselected curvature.